The FIS Lab is built on three decades of outcome research showing that who provides therapy matters more than what kind of therapy they provide — and that the specific skills driving effectiveness can be identified and measured.
Differences between treatment models (CBT vs. psychodynamic, EMDR vs. exposure therapy) typically account for 0–1% of outcome variance. Differences between individual therapists account for 5–9% — and up to 17% in complex cases. This means your choice of therapist is far more consequential than your choice of therapy type.
Baldwin, S. A., & Imel, Z. E. (2013). Therapist effects: Findings and methods. In Bergin and Garfield's Handbook of Psychotherapy and Behavior Change (6th ed.). Wiley.
Wampold, B. E., & Imel, Z. E. (2015). The Great Psychotherapy Debate: The Evidence for What Makes Psychotherapy Work. Routledge.
Anderson et al. (2009) developed a performance-based assessment where therapists respond to challenging interpersonal scenarios. Therapists who scored higher on these Facilitative Interpersonal Skills (FIS) produced significantly better client outcomes. A 2016 prospective study confirmed that trainees’ FIS scores at the start of training predicted their client outcomes more than a year later.
The FIS framework measures eight dimensions: verbal fluency, emotional expression, persuasiveness, warmth, empathy, hope and positive expectations, alliance bond capacity, and rupture-repair responsiveness.
Anderson, T., Ogles, B. M., Patterson, C. L., Lambert, M. J., & Vermeersch, D. A. (2009). Therapist effects: Facilitative interpersonal skills as a predictor of therapist success. Journal of Clinical Psychology, 65(7), 755–768.
Anderson, T., McClintock, A. S., Himawan, L., Song, X., & Patterson, C. L. (2016). A prospective study of therapist facilitative interpersonal skills as a predictor of treatment outcome. Journal of Consulting and Clinical Psychology, 84(1), 57–66.
A landmark study tracked 170 therapists treating over 6,500 clients and found that therapists on average got slightly worse over time. Unlike surgeons, pilots, or musicians, psychotherapists lack the high-quality feedback loops needed for genuine skill development. Years of experience is not the same as years of improvement.
Goldberg, S. B., Rousmaniere, T., Miller, S. D., Whipple, J., Nielsen, S. L., Hoyt, W. T., & Wampold, B. E. (2016). Do psychotherapists improve with time and experience? A longitudinal analysis of outcomes in a clinical setting. Journal of Counseling Psychology, 63(1), 1–11.
Research on top-performing therapists found a correlation between time spent in solitary practice activities — reviewing sessions, mentally rehearsing challenging moments, seeking specific performance feedback — and better client outcomes. The study was correlational: it cannot tell us whether the practice caused the improvement, or whether therapists who are already more effective are also more likely to practice deliberately. Natural interpersonal gifts likely play a role the research hasn’t adequately measured — Chow et al. didn’t assess temperament or talent, so the study can’t rule them out.
The best available evidence for trainability comes from a landmark 7-year case study at the Calgary Counselling Centre: when an agency systematically combined routine outcome monitoring with deliberate practice, therapists improved at a rate of d = 0.035 per year. In a field where the default trajectory is stagnation or decline, any positive slope matters. But the effect is very small, achieved through the most intensive agency-wide intervention studied to date, and it remains a single case study.
Chow, D. L., Miller, S. D., Seidel, J. A., Kane, R. T., & Thornton, J. A. (2015). The role of deliberate practice in the development of highly effective psychotherapists. Psychotherapy, 52(3), 337–345.
Goldberg, S. B., Babins-Wagner, R., Rousmaniere, T., Berzins, S., Hoyt, W. T., Whipple, J. L., Miller, S. D., & Wampold, B. E. (2016). Creating a climate for therapist improvement: A case study of an agency focused on outcomes and deliberate practice. Psychotherapy, 53(3), 367–375.
Rousmaniere, T., Goodyear, R. K., Miller, S. D., & Wampold, B. E. (2017). The Cycle of Excellence: Using Deliberate Practice to Improve Therapeutic Effectiveness. Wiley.
Feedback-Informed Treatment (FIT) research shows that when therapists receive real-time data on how their clients are actually progressing — through tools like the Outcome Rating Scale (ORS) and Session Rating Scale (SRS) — deterioration rates drop by roughly half. Therapists are systematically poor at detecting when treatment is failing without structured feedback.
Lambert, M. J., Whipple, J. L., & Kleinstäuber, M. (2018). Collecting and delivering progress feedback: A meta-analysis of routine outcome monitoring. Psychotherapy, 55(4), 520–537.
Since Rosenzweig (1936) first proposed that all therapies share common healing factors, decades of meta-analyses have confirmed that bona fide psychotherapies produce approximately equal outcomes. The most potent common factor is the therapeutic alliance — the quality of the therapist-client relationship — which accounts for approximately 7.5% of outcome variance (d = .57). Empathy, goal consensus, and positive expectations each contribute additional variance.
Horvath, A. O., Del Re, A. C., Flückiger, C., & Symonds, D. (2011). Alliance in individual psychotherapy. Psychotherapy, 48(1), 9–16.
Wampold, B. E., & Imel, Z. E. (2015). The Great Psychotherapy Debate. Routledge.
A therapist’s professional degree (Ph.D. vs. Masters), years of experience, or licensure status are not significant predictors of client improvement. Some therapists consistently produce worse outcomes than no treatment at all — and without outcome tracking, neither they nor their supervisors know it.
This is not a critique of training or credentials. It is an argument that training must focus on the specific skills that predict outcomes — not assume that education and experience will produce them automatically.
Wampold, B. E., & Brown, G. S. (2005). Estimating variability in outcomes attributable to therapists: A naturalistic study of outcomes in managed care. Journal of Consulting and Clinical Psychology, 73(5), 914–923.
Most FIS and common factors research has been conducted in Western contexts. While core skills like empathy appear to generalize broadly, the way they are expressed — eye contact norms, verbal directness, the role of silence, family involvement in treatment — varies significantly across cultures. Culturally adapted interventions produce better outcomes than unadapted ones.
The FIS Lab aims to be a starting point for self-reflection while acknowledging that effective therapeutic communication must be applied with cultural humility and adaptation. Our scoring rubric explicitly avoids privileging any single therapeutic orientation or cultural norm.
Griner, D., & Smith, T. B. (2006). Culturally adapted mental health interventions: A meta-analytic review. Psychotherapy, 43(4), 531–548.
The bottom line: Therapeutic effectiveness is not fixed. It is rooted in measurable interpersonal skills that predict client outcomes — and for some clinical presentations, in specific technical competencies like the skilled delivery of exposure protocols. The FIS framework captures one critical piece of the picture, not the whole thing.
The FIS Lab is a practice and self-reflection tool — not a validated clinical assessment, a training program with proven outcomes, a credential, or a replacement for supervision. AI-generated scores are directional feedback, not psychometric measurements. AI scoring has not been validated against trained human FIS raters.
Considering therapy? There’s a version of this research written for people on the other side of the room — what 30 years of outcome research says you should actually know before your first session.
Read: What the Research Says Before Starting Therapy →